https://bitcointalk.org/index.php?topic=499580.0 Poloniex hacked. But this time, some transparency, which I find somewhat acceptable.
It is good to see he was very open with what happened. This does show that there are people (or groups) out there looking for vulnerabilities. Right now a lot of the exchanges are very small operations, even when they give the appearance of being much bigger. Any small exchange with limited man power and resources will find it hard to eliminate the risk of such attacks, especially when there are very smart people out there looking for the loop holes. My prediction would be that over time we will see the operation of exchanges move into the hands of bigger entities with more of a chance of stopping such hacks, which will push these 'garage' operations out of the market.
The more this happens the less confidence there will be in anything to do with digital currencies - not good.